Using Timer task (of Intermediate catch event section) is throwing an exception

[sanbhat]

My workflow is something like this  [start --> workItemTask --> Timer --> scriptTask --> anotherWorkItemTask --> continued... ] . I am using Timer to basically invoke scriptTask for sometime, every 1 second, until some value changes (I am trying to simulate a while loop here).

The timer task has 2 sections

1. Time Duration  - for which i have given a value of 0d0h0m1s0ms

2. Time Cycle - for which I have given a value of 0d0h0m1s0ms

Now I expect the script task to be invoked, after a delay of 1 second, for every 1 second. This is not happening. Instead, when this point reaches, JBPM is throwing below exception

java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException

  at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:164)

  at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newKieSession(KnowledgeStoreServiceImpl.java:70)

  at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newKieSession(KnowledgeStoreServiceImpl.java:39)

  at org.kie.internal.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:121)

  at org.jbpm.runtime.manager.impl.factory.JPASessionFactory.newKieSession(JPASessionFactory.java:42)

  at org.jbpm.runtime.manager.impl.PerRequestRuntimeManager.getRuntimeEngine(PerRequestRuntimeManager.java:66)

  at org.jbpm.process.core.timer.impl.GlobalTimerService.getCommandService(GlobalTimerService.java:208)

  at org.jbpm.process.core.timer.impl.GlobalTimerService.getCommandService(GlobalTimerService.java:192)

  at org.jbpm.persistence.timer.GlobalJpaTimerJobInstance.call(GlobalJpaTimerJobInstance.java:67)

  at org.jbpm.persistence.timer.GlobalJpaTimerJobInstance.call(GlobalJpaTimerJobInstance.java:46)

  at java.util.concurrent.FutureTask.run(FutureTask.java:262)

  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)

  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)

  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

  at java.lang.Thread.run(Thread.java:745)

Caused by: java.lang.reflect.InvocationTargetException

  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

  at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

  at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:150)

  ... 15 more

Caused by: java.lang.IllegalArgumentException: Timer service 'new org.jbpm.process.core.timer.impl.RegisteredTimerServiceDelegate("default-per-request-timerServiceId")' not found

  at org.drools.core.SessionConfiguration.newTimerService(SessionConfiguration.java:495)

  at org.drools.core.time.TimerServiceFactory.getTimerService(TimerServiceFactory.java:27)

  at org.drools.core.impl.StatefulKnowledgeSessionImpl.<init>(StatefulKnowledgeSessionImpl.java:366)

  at org.drools.core.impl.StatefulKnowledgeSessionImpl.<init>(StatefulKnowledgeSessionImpl.java:278)

  at org.drools.core.common.PhreakWorkingMemoryFactory.createWorkingMemory(PhreakWorkingMemoryFactory.java:21)

  at org.drools.core.impl.KnowledgeBaseImpl.newStatefulSession(KnowledgeBaseImpl.java:1304)

  at org.drools.core.impl.KnowledgeBaseImpl.newStatefulSession(KnowledgeBaseImpl.java:1289)

  at org.drools.core.impl.KnowledgeBaseImpl.newStatefulKnowledgeSession(KnowledgeBaseImpl.java:292)

  at org.drools.core.impl.KnowledgeBaseImpl.newKieSession(KnowledgeBaseImpl.java:378)

  at org.drools.persistence.SingleSessionCommandService.initNewKnowledgeSession(SingleSessionCommandService.java:125)

  at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:92)

  ... 20 more

Caused by: [Error: could not instantiate class: null]

[Near : {... new org.jbpm.process.core.timer.im ....}]

                 ^

[Line: 1, Column: 5]

  at org.mvel2.ast.NewObjectNode.getReducedValue(NewObjectNode.java:307)

  at org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:106)

  at org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:49)

  at org.mvel2.MVEL.eval(MVEL.java:92)

  at org.drools.core.util.MVELSafeHelper$RawMVELEvaluator.eval(MVELSafeHelper.java:406)

  at org.drools.core.SessionConfiguration.newTimerService(SessionConfiguration.java:493)

  ... 30 more

Caused by: java.lang.reflect.InvocationTargetException

  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

  at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

  at org.mvel2.ast.NewObjectNode.getReducedValue(NewObjectNode.java:278)

  ... 35 more

Caused by: java.lang.IllegalStateException: TimerService with key default-per-request-timerServiceId was not found in the registry

  at org.jbpm.process.core.timer.impl.RegisteredTimerServiceDelegate.<init>(RegisteredTimerServiceDelegate.java:59)

  ... 40 more

Googling did not help. So i am posting this here. Doesn't timer task comes by default with JBPM runtime? Do we need to add something through the API ? Here's how I am creating the runtime

   EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.jbpm.services.task");

   RuntimeEnvironment environment = RuntimeEnvironmentBuilder.Factory.get().newDefaultBuilder().entityManagerFactory(emf)

   .userGroupCallback(new JBossUserGroupCallbackImpl(getUserGroupProperties()))

   .addAsset(ResourceFactory.newUrlResource(workflowFile), ResourceType.BPMN2)

   .get();

       // "workflowFile" refers to the absolute URL to the .bpmn2 file in the system. Eg: file:///c:/test.bpmn2

   RuntimeManager runtimeManager = RuntimeManagerFactory.Factory.get().newPerRequestRuntimeManager(environment);

   RuntimeEngine runtime = runtimeManager.getRuntimeEngine(EmptyContext.get());

   KieSession ksession = runtime.getKieSession();

        ksession.startProcess(...);

[swiderski.maciej]

this error:

TimerService with key default-per-request-timerServiceId was not found in the registry

means there is no runtime manager available called 'default-per-request' as when it is created it will register it's timer service. So please double check runtime manager was not closed after process was started.

Not sure what version you use but might be worth checking with latest final (6.1.0) or release candidate (CR2) of 6.2.0

HTH

[sanbhat]

Thanks for your answer.. I have now changed the runtime manager to be singleton, and timer is not throwing the exception.

RuntimeManager runtimeManager = RuntimeManagerFactory.Factory.get().newSingletonRuntimeManager(environment);

Regarding second part of my question (while loop using timer)

I have created a timerTask with following definition.

<bpmn2:timerEventDefinition id="TimerEventDefinition_1">

        <bpmn2:timeCycle xsi:type="bpmn2:tFormalExpression" id="FormalExpression_158" language="http://www.java.com/java">1s###1s</bpmn2:timeCycle>

  </bpmn2:timerEventDefinition>

this means that, The timer will have a delay of 1s before moving the execution to the next task, and it will repeatedly execute the next task, for 1second each. Am I correct?

This is not happening. In my case, the timer gets fired after a delay of 1s, but continues to execute the susequent tasks, without repeating the cycle (loop). Can you please help me with this?

[swiderski.maciej]

timer cycle will trigger subsequent nodes every 1 second, meaning all activities that follow the timer will be triggered multiple times. Depending what is after timer it might be the case that process instance reaches the end event that terminates the process instance and that's why timer is not firing anymore.

But without seeing the actual process I cannot tell for sure

HTH